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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47edfdf113b55da69fb4585863335d6a93abdf49e9ceb462626a030f6276b2b2' 
  AND token = '/8MNilMUCcBQpJBBIVbctAnU4AtVrMv3LB7BoE+nFrk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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