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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '932bf3b77ba8af1542d84eec225f9317d8fa0833c50ad2d731d04518ebf28978' 
  AND token = 'G8BjFN1UG4GjfKovJecSUyEug9VGN474EVTOB0g82F8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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