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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c2c677c0ee66b78f28a590e444ff26f8dfdfdbe0d817b9b4148748f4190ba43' 
  AND token = 'M+d8OpNeafh8wXJ7ufNaA5BpIT4TbO5Hi820GjnG/Dw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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