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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e1db1320603a5bb85445c5ae9f40e42f513c7acd47b2fdf2ee4e136bdd94fcc' 
  AND token = 'OrToD+2Ea3cqNvnzLjy5HgYGahh3n7s+5asdSqJhgO8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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