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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f56a216e5b9b005b8f728d3534a6037e6b349be2b5fefa8bfd9bcc54c2799e8c' 
  AND token = 'i4EMebpE+CnSJDQF65jgbJT/PO8PCxjOFVmupHrNaNA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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