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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2945e8af44b0cb2281a423520f9771363343ec24aad97e48f5c195e945101096' 
  AND token = '+bIirVT4ZlAENOECEpQhiYR7/wonetF2/TnvDwUypSY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00103

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}