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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f901cf1d3c6d5fc27b714ac9881929a91ae08f27369a58f0f1fa9656e42960b' 
  AND token = 'GTITaGA3x6fa0SvzozZN/jp6d9/L1+HAGKjMaOrNQU0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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