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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ef8c6ef61157b448bd6717f3fdf676427403c8f6d55285654c74c96ddbdb68b' 
  AND token = 'F7zjqhNlcDtz9j++vpjB2joMJlNj0W3Br0wSJha52Qo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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