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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2729ded3c693c2ef03b04ab51c6eaa5a7c27c87847e5a9b5007cb9a732f2a116' 
  AND token = 'ySBf/ygHWCd0JTClhrrNOPo+OCcsXSP2IjjgASRTEGk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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