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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94173c6caee4f4e8f3398a1086d721432d920e1c7871bfde6b5ebf6218a8e7e8' 
  AND token = '8BbjdzrS58LY8+OQ5HOtN5zG0T4eQ94sAw3BczIwMCI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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