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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '947d88f2b97d3d8a8efd5fb8eddf4b0123e288c23c68aab513a222a709b77e4d' 
  AND token = 'km8PdFVLfbYB9tL36fOZi7oXMToFUNTMXmbdVNqdK+o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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