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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f3e31ecbe44ee8a7e260880d298d66b7352955ed98c1597a13d9938431b2701' 
  AND token = 'SwVE7pnNltsVPdlfararIwXVDKbd6KuJUAG7FKTFPb8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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