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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e07992a207121468997ce5bc2950f8b568d0ae7fb82ee6efd8d1baafc3e12291' 
  AND token = '0mdmJxnkoXIWSDn9YK6loddjQilLMdAY4nvXJSciVOY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00112

JSON explain

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