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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6bf3b103a29c88a2496026539dac6c71267835b8ba094f1e0aa7fc71023e153e' 
  AND token = 'UHNFAYF7jjshY3/Eov3fKD1xnPYUseF2XfX4/sur51E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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