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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca4a8e03f2add62ef59d9d11cc55abe179462da42d2ff2341f92c7dc5ef12df9' 
  AND token = 'sOT4+OLCJ5z9QoD/MxQo7aHiCd/qEb63inQt06yzktk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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