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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a67c56f0440c8039ddec2d115ffcf02c9af50a39ec9affbd03ab4837ab9cb2d' 
  AND token = 'wHqDfIE+65PFFm5IZMB33msSixGf0c3RcSLiIbfK6fo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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