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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '360363743eeb9781dc3a08e1eab343587370b1aa8804f00a0c3beb9d22ad1bfe' 
  AND token = '1BlsFq804yIgQb0GgL50aaBbbj2KhLe+XU6rzgXRWKc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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