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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd3733edf1efda4e21d289ef48cc7417638d6881a23c3e1640590cf3c8c6ea45' 
  AND token = 'iiMbiXvdG7m/yZMEFC18CUK3+oYuYQDDWCZBBrxP7nI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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