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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '22a7e3b8b097209f0c14bb434627f8e62faf15df18125f018f6284e8385e5413' 
  AND token = 'ng6eK8iidI4OD1572USCQZ6t0b0AA0BEeLTjVjX+6Pk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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