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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e635e52b7d551f947677c8412a7e2843ac86a4e8723c2eb5ebaeb0a201fab803' 
  AND token = 'IwIAMxyrqsCKxlGRXW+bmEH+2xknel3WIDyXcFkLA6I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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