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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '681f249107e43400cb2e930d7a7f86a99c3064a6c2de633d5f199dd72b490685' 
  AND token = 'aN4tpS3CKl/Njm5FrTrxdfnxn+5gFzjMwkfpAmsK1HA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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