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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82bc63839c4753128eaf7509d26eeb749bfcf24c0df71b3a21f7d36d6d7b22e5' 
  AND token = 'e6Bko+pmZm23f41xiTlxnLB3DBdF3iRoZ8ofn1eIg8w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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