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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5892ffb85812ed70b88b853af1c66c5ac290a8004704de24b131b38557cac28d' 
  AND token = 'm+M80JNyiIU/1kIiRDx3TFK0ozvGTvUkl5FC2WXPpjo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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