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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbcb4469d493066ff36fb01380d177d229a7ffdbf8d76a2064d938d7973b91cc' 
  AND token = 'x63dlQ8xkvtp/zTq9YWsfix1Af1YVWfKFweOI81sCZE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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