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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24363e83c47011b942d83ad453757b832efcc82e8df06d43c46df4aca6c9d7c3' 
  AND token = 'BP6VqutYkrtI25Jw72dQQdCaft9UPd+GRJl+nA/ogao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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