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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9fc3fe78ef17f3bbd69851e90728254c951ac3fcf85212db730fd8c37b7e101' 
  AND token = '4t8sf1Xmw/Fb9aRWPas/61GMfbUiXjSqaCqQx/O89JU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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