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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97150cacbddb719ba6b077c1c69910fd5ff1ddc5415bb88df0033b90fd5326f5' 
  AND token = 'qd/9v0qx7uW9S2ZFAW+oZfvyrgdSX+jFHbNa1Afb8j8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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