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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b95fa7e44a43db9685bdbf7bcfe513ec017d4424ceb8ac35e987fe89cb0ac3b1' 
  AND token = 'oA8Xv6ht6EAZT+gpfcNG59Btb4YzC+J2RaRV7++RJGE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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