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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a2b8ae7c93439905901d9d475418d72776f8ab9fd2524204b84ee51bd476683' 
  AND token = 'ZrPc8RRCZxMIx031DTQheQXkRCG/DgEuKfNiAdaSb3E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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