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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '229fa9364fb1a0ab4fd9cfe7145c45bc3c8404a7677d5012d7f9cbea17278dfb' 
  AND token = 'fBlfDZDIpGOPZG3RsbnOese51uZTvk1KlU+rnUz+IZU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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