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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8981235310da1e087288162e832a1a2d3bf790c757bd6a052cf47347791bd16' 
  AND token = 'j+TWrKtqJ0OiNVhmTi7oKE+Wk9BjRo1qTpjT4cK1pH8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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