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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f213c1abe847867856b6aa22d072394281d60b360e70b38ea4fbee89cbab2118' 
  AND token = '0Urk22c3fL7/xNIak5n4PHgRgr8BWyUrnvxYQZzj8Vc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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