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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bccca23b7663ac0c327e143b0fe4fc0954934b980e52e92aa4144e0d4c275cdf' 
  AND token = '99rEw8Fh2HAOxlNuVSOiWYRXf8NF4jwLn7r4CAiHuws=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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