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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fee6a0ca90384b8f5b940eca72fae765b950701c0f2dae5a3cbe285e5de50cd5' 
  AND token = 's+uLkzniXwMZN7AY11EUG4y13iyR3sM3L+UENeQGYfE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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