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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20ef58cbe64ccda59c73e5bc4e2f8a7e18eaa5ed29dca73036f1a5ffc5dbd027' 
  AND token = 'V0Xlsxaqewlb0jfO7Q6g8byjSqb/6aQCy1Sv97RmJbo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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