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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37d6a3183c40da7054877dfb59c6b156166ae236ad02b37cb972f166ccd59540' 
  AND token = 'LJLTsMZf9KZkFkJ3c73is2hT0Lp/q3c1gYncnIwhFWM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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