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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88cf841840793cea6d53aaf1e9df5e6010d46633adfcdb6fe14556af15729cfb' 
  AND token = 'hT2W0yoy5JK52rjcJ72GEDDBBXOYKCpYD8CmlenEZhs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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