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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0cdc70cce6973e43910ed643dc5da4f712f9e6f1b549462a236e25763762587c' 
  AND token = 'GjimbvpPzxrmRvPFGRUWmyv7dz2rlkEYLRx972RcYzo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00137

JSON explain

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