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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ed8c8b35f4c4cf8af3a30f058ec77f981dd263d06f7520cd2e446a96923dbb9' 
  AND token = '3ri03noJTckV6xFrbz4x0Fx3MA0e1OZPJrpTqrwdyl0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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