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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0fd2f66a98e2787415b9ff136c4a077d49bdef3f2944ca208d65aa5cb60e02c8' 
  AND token = '5+P2alWcibtKWH8qOu8TD+67/pf4THX6xx2fLkZBsu4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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