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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9381e7b7af3bc9277581bca8f8894261c362057b735e05cd3d0ade2f69e1709' 
  AND token = '5xcuvf2vW3njkQfbc0QJADdEJ+JpO+7XVo0hPb63TLk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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