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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '043d15228dbccc0d49aa37640a903f4b4fbb4306179b5cd62c4c7aeb0d83d866' 
  AND token = '36Of+8yhCmByU61xPIRTRK0o98/9hlTBcdBzKbD0fXI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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