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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff42182efa8b8993549ad4f75de3605da956aa289928eee186e96fedb5763e67' 
  AND token = 'mtyp71kWg0M1El67Q1aA84OxhE4NjQFuCSw1fO6/mnM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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