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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2889758da6f1a5f90f27ffee49ebd9813ed0e384bfcfec1c00816b9e3103e1b0' 
  AND token = 'k7cPe3kA7jf+lNezYGxXU5OUfM5l8AgdAN+bPa1ZcKE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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