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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '635d952cc13c64ccbbf927370c9987205bb6e208ce8eed71b0911213ae7157cc' 
  AND token = 'e9DhoEWBP/PSIF8oYdm8/UvSDBwVFFzth8V+0oLSQ4s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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