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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e838a18f4aec2345591767f1bceca582fa1781d2a71e1624a0438773457c621' 
  AND token = 'qsU7GvSgo/FdF9unbucWniaXZfG0BwnttGAQQFDzs4w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00498

JSON explain

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