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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08d699c851a1db808816101deed7f94551f6a7688a17d2d5e9031572398d35fd' 
  AND token = 'C42yVnMd/hbk16xFa/QnOi2Yz99hCvwJgoDJvQi7auY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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