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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4dde438b6dfd4f4470a23aef306d7fc56b7067ef84a4d303df1f20bcc841014e' 
  AND token = 'ay2h0ezTDomAFDiC9wHSIo7yqOr73vNc9D9f/hanAeg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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