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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd549277385fe70050b82f97d0dde97ab5d338620875982743b8feef051705f4e' 
  AND token = 'NeWyJmSMH0Al7sZWgIx1a5MxIh5Iv58+NI3InQKOhHQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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