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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b94bfa1ba9fbbf9662982e7c0bf7a4c9dc757c024a1c18a19c7af8fba59ae156' 
  AND token = 'Xn4hheyouRpV2/1AwNQbfvk6Oj7LGjRveQMsSBEXCVs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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