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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df8bc6cdc034d877c57cbc1b0eedf86d6ed929798d83b2d7326f392f952547a8' 
  AND token = 'ur2dz9MaGh4UPsXUiW/h31hEaOFsHkZP8Sgz08u+h9U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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