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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '772e5593a545ff46297ebda933b9049c7b3157c2b393c519bceec0d69bfe3698' 
  AND token = 'yGxCGNAzLd2oee/2fOMSvr2HSatENVMa0QdpMvylz9U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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