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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b02c5d170a37737c86302135e2a0e462005ad1a7a84c9d5daefc6a810da53b93' 
  AND token = '/gVHjm9ckpximO+YbDbXVkBtpJRQPaFScXOiXlyZXYA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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