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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f08630ae76c4643ab3d2caa38ad201b41c5aa18cc87d3cd007f18b28a04c6d80' 
  AND token = '2ury8EHdmPXVT+m8fqlqVEoAubhGrcXhole48YrFwqI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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