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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd710aa9e01a432f11cf21eb122c53c6f0b84b84750043d63547fc75be35b0a7b' 
  AND token = 'oEt13DtTllQ43XtJsAf4TOo0UR2YPQL52UKAPnMN9tU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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