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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68545b31af9438b4387a1ca23e7d810a41e267277d5ad2c7c8c1ba18cb2b078b' 
  AND token = 'LFScqA9vRvIzXntn865nBs8x3ig6GUkJYp1rnL8KFSo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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