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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e18d0f37689c1afc44f6ff982e8660be0ef38a11fab41af96f24494053dadf3' 
  AND token = 'l4VcC+p2FyK6gIeDcF/4xz4HYJExSJGq3riu6qNSfMM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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