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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63fb4767ec07677301f734971e4678ce56233a93f88bfe6d2ec381aea6c90e6b' 
  AND token = 'xkvCegoajs0mSHXn/sg6srE/WpLuB7qay8OAnsi0eUw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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