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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd41cd70e062cddf08e45650a41a4b71878daba5d357a27a35f7c4102cf71220b' 
  AND token = 'l1nf+8hmQ5IXavEXDPHQCWz+YXiosFqe/RDyPhmI97k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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