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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf4c30e41619141803b61154d901f10d41d42ec81d8385f6c9efda2370a0ef1c' 
  AND token = 'KOgeU99uLb44Xr2hmuu+kAd6/RBqjGkwlqr1RmZ/XFc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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