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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0f7cda10a0d53ca2b66132acb71650c5127e4b1b776ebcc9b3ab9e40abae19e' 
  AND token = 'w7N/+Un7S/H9tuoOtFuUV075/sDUaRfLJZ2CybXxyA0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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